# Relationship history for MSHA mine 0101876

Current hierarchy: **Burgess A E-Charles R-Wm C → Burgess Mining & Construction Corp → Gurnee Strip Operation**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Burgess A E-Charles R-Wm C Et Al → Gurnee Strip Operation; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burgess Mining & Construction Corp → Gurnee Strip Operation; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burgess A E-Charles R-Wm C Et Al → Burgess Mining & Construction Corp; 1978-05-01 to current/open; source msha-controller-operator-history